Decide what to do with the `api.spacex.com` data dependency

[martinbonnin]

The REST calls to api.spacex.com recently broke. It would be nice to make the tutorial work without api.spacex.com

Currently the tutorial is not using the API (the list of launches is static and will not reflect new launches). We might want to rework that part to either use another endpoint or investigate with Cloudflare what's wrong.